Thermostat



(No Model.)

W. F. SINGER. THERMOSTAT.

No. 450,260. Patented Apr. 14,1891.

i .I.Hh[HIIIHIIIIIIIIIIMILIIIII l x x 1 @dwf GJ l m Mugj UNITED STATES PATENT OEEICE.v

VILLIAM F. SINGER, OF CAR'llill/XGE, ASSIGNOR OF ONE-HALF TO GILBERT Il. IIAYILAND, OF SYRAOUSE, NEW YORK.

THERMOSTAT.

SPECIFICATION forming part of Letters Patent No. 450,260, dated April 14, 1891.

Application tiled July 29, 1890 Serial No. 360,314. (No model.)

To @ZZ whom it may concern:

Be it known that I, WILLIAM F. STNGEE, a citizen of the United States, residing at Carthage, in the county of Jefferson and State of New York, have invented certain new and usefulImprovemen ts in Thermostats and I do declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to the letters of reference marked thereon, which form a part of this specification.

This invention relates t0 certain new and useful improvements in thermostats; and it has for its object to generally improve upon the construction and to render more eflicient in operation this class of appliances.

The more immediate object of the present invention is to provide a thermostat which is adapted especially for use in connection with closed-circuitfire-alarm systems, the construction of the instrument being such as to adapt it to automatically break the circuit when the temperature has reached such a point as may be necessary to fuse the disk-retaining devices, as will hereinafter appear, and also to afterward restore the current or circuit, thus indicating that the operation of the instrument was due to a genuine fire in contradistinction to the alarm which would be given in case of accident or through malicious tampering with the instrument, either of` which causes would serve to operate the thermostat and cause a break in the circuit, but would not again restore it to its normal closed condition.

To these ends and to such others as the invention may pertain, the same consists in the peculiar construction and in the novel combination, arrangement, and adaptation of parts, all. as more fully hereinafter described, shown in the accompanying drawings, and then Specifically defined in the appended claims.

The invention is clearly illust-rated in the accompanying drawings, which, with the letters of reference marked thereon, form a part of this specification, like letters of reference indicating like parts throughout the several views, in which- Figure l is a betteln plan view of a thermostat constructed in accordance with my invention. Fig. 2 is a central vertical section of the same, showing the parts as they appear when in a normal condition. Fig. 3 is a top plan view. Fig. l is a central vertical sec tion of the instrument, showing the parts as they appear after the instrumenthas been acted upon by a rise in temperature. Fig. 5 is a like view showing the position of the parts after the circuit has been automatically restored.

Reference now being had to the details of the drawings by letter, A represents the thermostat, which is made of sheet metal and is of the usual forni, being secured to the ceiling of the apartment by screws passed through openings a in the ears I3, which ears extend beyond the periphery of the top plate O. The blocks of hard rubber D and D are secured to the inner walls of the case upon opposite sides of the same, the block D being upon a higher plane than the block D as shown.

E and E are strips of spring metal, which are secured to the blocks D and D the opposite or free ends of the strips being provided with contact-points F.3 and A supplemental bottom F, composed of the two sections F and Fis supported upon theinwardly-extended projection G, and at the cen` ter of this bottom afusible plug c is inserted in a screw-threaded opening provided for its reception. A post H, having its lower end screw-threaded, is inserted within the screwthreaded opening c in the bottom F, the up per end of this post bearing against the lower face of the spring E, forcing the free end of the said spring upward slightly, as shown in 9o Fig. 2 of the drawings. The bottom I is of sheet met-al, and is preferably convex upon its exterior surface. To this bottom is secured the lower end of the post d, the upper end of the said post having a bearing against the lower face of the spl'ingarmE. The bottom I is secured in 'place by the fusible plugs I which are inserted within the screw-threaded openings provided in the lower edges of the case for their reception. The current is IOO maintained through 'the contactpoints carried by the spring-arms E and E', the wires leading to the different poles of the battery being connected to the screws, which secure the said strips to the hard-rubber blocks D and D', as shown.- In operationan increase of temperaturei the apartment sufcientto cause the fusion of the plugs G will cause the bottom to drop out, thus removing the supporting-post el from its engagement with the spring-arm E which springs downward, separating the contactpoints and breaking the circuit, the parts assuming the positionsindicated in Fig. 4 of the drawings. The bottom having been thus removed, the heat is given access to the fusible plug c, which is in turn melted, allowing the sectional bottom F and F2 to drop, the section F carrying with it the post c', and the spring-arm E is thrown downward by the elasticity of the spring material of which it is composed, thus causing the contact-points to unite, as shown'in Fig. 5, and closing the circuit, this closing of the circuit serving to give notice of the fact that the action of the thermostat has been due to an actual tire.

Having thus described my invention, what I claim to be new, and desire to secure by Letters Patent, is-

I. A thermostat having contactpoints carried by spring-arms, two independent bottoms, each bottom beingheld normally in position by fusible plugs, and supports between the respective bottoms and the spring-arms carrying the contact-points, whereby an electric circuit will be broken and afterward restored by the displacement of the respective bottoms occasioned by the fusing of the plugs, substantially as described. v

2. A thermostat having two independent bottoms each held normally in position by fusible plugs, spring-arms carrying contactpoints, through which the circuit is maintained, and posts or supports for said arms connected with the bottoms, substantially as shown and described, and for the purpose specified.

3.' The combination, with the case, th

spring-metal arms, and the contact-points car-` ried by said arms, of two independent bottoms normally retained in place by fusible plugs, and connections, substantially as described, between said bottoms and the springmetal arms, whereby the circuit through the thermostat will be automatically broken and subsequently closed by the fusing of theplugs retaining the bottoms, substantially as and for the purpose described.

In testimony whereof I affix my signature in presence of two witnesses.

' WILLIAM F. SINGER.

Witnesses:

FRANKLIN H. HoUGH, C. W. CURTIS. 

